Greenheck USF and CSW (479870) - Manual (Page 14)

Utility and Centrifugal Fans 14
®
Wheel and Fastener Maintenance
Wheels require very little attention when exhausting
clean air, however, air heavily laden with grease or
dirt will tend to accumulate on the wheel causing
unbalance. Wheels exhausting dirty or grease-laden
air require frequent cleaning to assure smooth and
safe operation.
All fasteners, including set screws in the bearing
collars, should be checked for tightness each time
maintenance checks are performed.
A proper maintenance program will help preserve the
performance and reliability designed into the fan.